Pediatric Respiratory Illness Surveillance

Children < 18 years old who presented with fever and/or respiratory symptoms of duration < 14 days were eligible if they resided in the study catchment area, which included the following nine counties in Middle Tennessee: Cheatham, Davidson, Dickson, Montgomery, Robertson, Rutherford, Sumner, Williamson, and Wilson. We selected the counties based on geographic proximity to Davidson County. We excluded children who were previously enrolled for the same episode of ARI in the past week, newborns who were never discharged, children with fever and neutropenia or a known nonrespiratory cause of symptoms, and children who were hospitalized for > 48 h.